Crystal structure of SjGST in complex with GSH and ellagic acid at 1.53 Angstrom resolution

Experimental Data Snapshot

  • Resolution: 1.53 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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Molecular basis of inhibition of Schistosoma japonicum glutathione transferase by ellagic acid: Insights into biophysical and structural studies.

Akumadu, B.O.Pandian, R.Olfsen, J.Worth, R.Thulo, M.Mentor, T.Fanucchi, S.Sayed, Y.Dirr, H.W.Achilonu, I.

(2020) Mol Biochem Parasitol 240: 111319-111319

  • DOI: https://doi.org/10.1016/j.molbiopara.2020.111319
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Schistosoma japonicum glutathione transferase (Sj26GST), an enzyme central to detoxification of electrophilic compounds in the parasite, is upregulated in response to drug treatment. Therefore, Sj26GST may serve as a potential therapeutic target for the treatment of schistosomiasis. Herewith, we describe the structural basis of inhibition of Sj26GST by ellagic acid (EA). Using 1-chloro-2,4-dinitrobenzene and reduced glutathione (GSH) as Sj26GST substrates, EA was shown to inhibit Sj26GST activity by 66 % with an IC 50 of 2.4 μM. Fluorescence spectroscopy showed that EA altered the polarity of the environment of intrinsic tryptophan and that EA decreased (in a dose-dependent manner) the interaction between Sj26GST and 8-Anilino-1-naphthalenesulfonate (ANS), which is a known GST H-site ligand. Thermodynamic studies indicated that the interaction between Sj26GST and EA is spontaneous (ΔG = -29.88 ± 0.07 kJ/mol), enthalpically-driven (ΔH = -9.48 ± 0.42 kJ/mol) with a favourable entropic change (ΔS = 20.40 ± 0.08 kJ/mol/K), and with a stoichiometry of four EA molecules bound per Sj26GST dimer. The 1.53 Å-resolution Sj26GST crystal structure (P 21 21 21 space group) complexed with GSH and EA shows that EA binds primarily at the dimer interface, stabilised largely by Van der Waal forces and H-bonding. Besides, EA bound near the H-site and less than 3.5 Å from the ε-NH 2 of the γ-glutamyl moiety of GSH, in each subunit.

  • Organizational Affiliation

    Protein Structure-Function Research Unit, School of Molecular and Cell Biology, Faculty of Science, University of the Witwatersrand, Johannesburg 2050, South Africa.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutathione S-transferase class-mu 26 kDa isozyme
A, B
218Schistosoma japonicumMutation(s): 0 
Find proteins for P08515 (Schistosoma japonicum)
Explore P08515 
Go to UniProtKB:  P08515
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08515
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GSH

Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]
C10 H17 N3 O6 S
REF (Subject of Investigation/LOI)
Query on REF

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G [auth B]2,3,7,8-tetrahydroxychromeno[5,4,3-cde]chromene-5,10-dione
C14 H6 O8
Query on CL

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E [auth A],
I [auth B]
Query on NA

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D [auth A],
H [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.53 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.44α = 90
b = 89.26β = 90
c = 91.72γ = 90
Software Package:
Software NamePurpose
xia2data reduction
xia2data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Science and Technology Funding CouncilUnited KingdomST/R002754/1

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-19
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection
  • Version 1.2: 2020-10-21
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Database references, Refinement description